Mr. Kassay has become quite an art market darling in the past year, but he doesn’t yet figure in museum collections — a key element in building long-term support. So two of his dealers — Art:Concept Gallery of Paris and Xavier Hufkens of Brussels — have come up with a clever solution: the sprawling, brand new eight-panel piece on offer at Art Unlimited will only be sold to a museum. […]

Mr. Hufkens added that a museum, in this case, means “a real museum.” “We won’t sell to a private foundation open to the public.”